Mercedes confirms Antonelli will start Italian GP from the back
Mercedes has confirmed that championship leader Kimi Antonelli will start from the back of the grid at the Italian Grand Prix. The penalty comes after the team chose to fit a new power unit, taking him beyond the season allowance.

Mercedes has decided that Kimi Antonelli will start from the back of the grid for the upcoming Italian Grand Prix. The team confirmed the move after choosing to give its championship-leading driver a new power unit.
That change takes Antonelli beyond the permitted allocation for the season. Drivers are allowed to use up to four power units across the year.
Both reports said Mercedes has dealt with reliability problems during the first half of the campaign, which contributed to the situation.
Sources (2)
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